Druck DPI612-PFP-35G Pressure Calibrator with FREE UPS II: The Druck DPI612-PFP-35G is a high-accuracy pressure calibrator with a wide pressure range of -14.5 to 35 psi. It features a built-in pressure sensor, a large backlit display, and a user-friendly interface. The DPI612-PFP-35G is ideal for calibrating pressure gauges, transducers, and other pressure-related devices. It comes with a FREE UPS II, which provides uninterrupted power supply in the event of a power outage.